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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a105b3a98d4209b16b12084bfe1b728be9c87d394f2cadf67fa3ca7e4c6863b4' 
  AND token = 'Sq54kHghdTwaQSYn9m036QlvHAf4lXudvu2rAzByuHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}